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Topological competition of superconductivity in Pb/Ru/Sr₂RuO₄ junctions

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arxiv 1106.6091 v1 pith:DXOFLWPJ submitted 2011-06-30 cond-mat.supr-con cond-mat.str-el

Topological competition of superconductivity in Pb/Ru/Sr₂RuO₄ junctions

Taketomo Nakamura , R. Nakagawa , T. Yamagishi , T. Terashima , S. Yonezawa , M. Sigrist , Y. Maeno This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords belowjunctionsr2ruo4superconductivitycompetitionsuperconductingtemperaturetopological
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We devise a new proximity junction configuration where an s-wave superconductivity and the superconductivity of Sr2RuO4 interfere with each other. We reproducibly observe in such a Pb/Ru/Sr2RuO4 junction with a single Pb electrode that the critical current Ic drops sharply just below the bulk Tc of Sr2RuO4 and furthermore increases again below a certain temperature below Tc. In order to explain this extraordinary temperature dependence of Ic, we propose a competition effect involving topologically distinct superconducting phases around Ru inclusions. Thus, such a device may be called a "topological superconducting junction".

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